Table of Content

01 June 2000, Volume 21 Issue 3 Previous Issue    Next Issue

For Selected:

Download Citations EndNote Reference Manager ProCite BibTeX RefWorks

Toggle Thumbnails

Characteristics of Basement Structures and Their Controls on Hydrocarbon in Qaidam Basin Chen Shiyue, Xu Fengyin, Peng Dehua 2000, 21 (3):  175-179.  Abstract ( 117 )   PDF (582KB) ( 183 )   Save Based on the information from lithology, gravity, magnetic field and magnetotelluric depth measurement and on analyses of basement structural characteristics in Qaidam basin, the study shows that the basin was shaped with in the stress field of compressional structures following Indo-China movement, in which well-developed faults were brought about. And Qilian southerm marginal fault, Qaidam northem marginal fault, Hubei-Lingjian-Dahuo fault, No. XI fault and Kunlun northem fault are confirmed along NW distribution and controlled by a compressive inter-ramping effect between Qilian moutains and Kunlun Moutains; while along NEE -NE direction, the development of A'nan fault, Tardin- Yuka fault and Germu-Xitieshan fault occurred due to intensive influences of Arkin structural belt. These two varied basement structures in orientation when composite and superimposed each other could have a major significance for controlling the development and distribution of caprock sedimentation constructions, resulting in the fact that at Qaidam's Mesozoic and Cenozoic basins have zonations with NW -SE strike and segments along NE -SW direction, which may, in a direct or indirect sense, control the formation, distribution and accumulation or reservoir of hydrocarbon resources in Jurassic, Tertiary and Quaternary. References | Related Articles | Metrics

Features of Hydrocarbon Sources of Cuoqin Basin in Northern Tibet Cheng Dingsheng, Li Yongtie, Gang Wenze, Gao Gang 2000, 21 (3):  180-183.  Abstract ( 72 )   PDF (402KB) ( 192 )   Save According to the sedimentation, structure and geochemistry of Cuoqin basin in northern Tibet, an analysis of characteristics of generating oil and gas from varied hydrocarbon source rocks is made. And a comprehensive evaluation permits to believe that it was sedimentary and structural evolution that controlled the development and spatial distribution of its hydrocarbon source rocks. The carbonate source rock with high thermal evolution and usual generation of gas is mostly located in Upper and Lower Paleozoic systems; undeveloped and limited source potential is found in Triassic and Jurassic; whereas in Lower Cretaceous presence of carbonate and muddy source rocks, with moderate thermal evolution and better source potential, provide major hydrocarbon source rocks in Cuoqin basin, the northeaster part of which will be the most favorable prospective area for finding oil and gas. References | Related Articles | Metrics

Potential of hydrocarbon Exploration of Mesozoic in Yingjisu Sag, Tarim Basin Yang Ruicai, Gao Weizhong, Yang Caihong, Du Lan, Su Wu 2000, 21 (3):  184-187.  Abstract ( 100 )   PDF (453KB) ( 259 )   Save The development of coal-series oil source rock is found in Mesozoic of Yingjisu sag,Tarim basin, its , abundance can also be well correlated with that of neighbouring producing areas, including Kuche depression, TurpanHami basin and Yingjisu basin. There exist abundant or more abundant matrix vitrinites and resinites found in the carbonaceous mudstone and coal deposit. By inference, there might be a certain organic facies in the open waters in Jurassic, providing good hydrocarbon source materials. Because of very similar thermal evolution comparing the sag with Well Taican 1, Turpan-Hami basin, it is predicted that a vast body of hydrocarbon source rocks has come of age. Dilling reveals that Mesozoic in this sag have ever brought about large- scale processes of petroleum migration. Carbon isotope analysis shows that the oil and gas came from Trissic and Jurassic coal measure strata. In addition, its structural frame work is similar to that of Turpan and Kuche depression, with multiple sets of source-reservoir-seal assemblages and good matched relations among the reservoir-forming elements,in time and space sense, and favorable structural highs surrounding eastern Yingjisu deep-trough for further petroleum exploration. However, a certain risk should be paid attention to due to a small depth of the Mesozoic for this exploration. References | Related Articles | Metrics

Conditions for Forming Carbonate Oil and Gas Reservoirs in Cambrian-Ordovician of Tarim basin Huang Chuanbo 2000, 21 (3):  188-192.  Abstract ( 101 )   PDF (557KB) ( 229 )   Save The extensive distribution of carbonate rocks formed abundant potential hydrocarbon resources accounting for over half of the total amount in Cambrian-Ordovician of Tarim basin, where hydrocarbon reservoirs have been discovered and classified into five types, including ten kinds of pools. In view of these reservoir conditions, petroleum sources and evolution analyses, it is believed that individual carbonate reservoir is in not very large scale, and tends to forming a group of oil and gas pools. They are normally characterized by high initial well production, prevailing to condensate gas cap, generally normal temperature and pressure system, multiphase reservoirs and modification by faulting. Hence the distribution of petroleum reservoirs should be controlled by regional structure,reservoir -seal assemblage, faulting and premium hydrocarbon source rocks. References | Related Articles | Metrics

On Fluid Conducting System in Petroleum System Jiang Jianqun, Hu Jianwu 2000, 21 (3):  193-196.  Abstract ( 76 )   PDF (399KB) ( 234 )   Save Fluid conducting system is an essential element in petroleum system where the oil and gas is believed to be a dynamic process from forming hydrocarbon source rock to trapping petroleum. When making a study of fuid conducting system, we have to take account of the time space relations among hydrocarbon source rock,fluid conducting stratum and seal before setting up the whole framework of fluid conducting system. This paper presents this system, including studies of source rock analysis, conducting network, fluid potential, abnormal pressure and fluid tracer techniques. Meanwhile, necessity of using behavior analysis method to study that system is highlighted. A case of application of that system in Yinggehai-Qingdongnan basin is also presented. References | Related Articles | Metrics

Re-Understanding of Seismic Geologic Sequence in Southwestern Area of Tarim Basin Wu Zhizhong, Chen Wenli 2000, 21 (3):  197-200.  Abstract ( 88 )   PDF (439KB) ( 157 )   Save Having calibrated, correlated and comprehensively studied the seismic and downhole data from southwestem area in Tarim basin, this article shows that there might be a Sinian between Bachu uplft and Tazhong uplift; the distribution of Middle and Upper Ordovician in south side of the southwest depression of Tarim basin remains not clear; while Lower Carboniferous lies almost in its west part. Also, it is confirmed that Kalashayi formation in Bachu area is not the same one as that determined by Kalashayi profile. References | Related Articles | Metrics

Evaluation of Jurassic Hydrocarbon Source Rocks in Northeastern Area of Tarim Basin Wu Changwu, Liu Zhen 2000, 21 (3):  201-203.  Abstract ( 89 )   PDF (315KB) ( 260 )   Save In view of types, abundances and thermal evolution properties of organic matter, an evaluation of the hydrocarbon source rock within Jurassic stratigraphic sequence framework in northeastern area of Tarim basin is made, ascertaining the source potential in Jurassic hydrocarbon source rocks lie in unmatured -matured stage, where low and high level system tracts have organic matters of too low abundance, with poor source potential; while lacustrine system tract has more abundant hydrocarbon source rocks consisting mainly of medium and fair source rocks as well as coal measures, with good source potentials. References | Related Articles | Metrics

Sedimentary characteristics and Evolution History of Middle-Upper Ordovician in Tazhong Area Li Yuping, Li Xinsheng, Zhou Yi, Yang Haijun, Liu Sheng 2000, 21 (3):  204-207.  Abstract ( 100 )   PDF (424KB) ( 222 )   Save Between the Middle -Upper Ordovician and Lower Ordovician in Tazhong low arch area assumes the contact relationship of an angular unconformity for lack of Dawan and Guniutan orders in Lower Ordovician as well as Miaopo order in Middle Ordovician. In its suroundings, Manjiaer sag, Tadong low arch and Tangutsbas sag are successive and transitional sedimentations. The stratigraphic correlation and depositional facies analysis showed that isolated carbonate tableland was developed in Middle-Late Ordovician in Tazhong area, with some subfacies of developed grain bank,lime mud hill and skeletal reef in platform suroundings. The depositional evolution of Middle-Late Ordovician underwent three periods, i.e. the rising outcrop period in late period of Early Ordovician to middle period of Middle Ordovician, the isolated carbonate platform-developed period in Middle-Late Ordovician to middle period of Middle Ordovician and the peperite platform-developed period of composite carbonate rock and clastic rock in Linxiang Wufeng stage of Late Ordovician. References | Related Articles | Metrics

Classification and Correlation of Middle-Upper Ordovician in Tazhong Area and Its Key Understanding Yang Haijun, Li Yong, Liu Sheng, Li Xinsheng, Chen Jingshan, Wang Zhenyu, Dai Zongyang 2000, 21 (3):  208-212.  Abstract ( 131 )   PDF (505KB) ( 248 )   Save According to the palaeontologic fossils, lithologic and electrie properties, the Middle-Upper Ordovician in Tazhong area can be divided, from top to bottom, into Sangtamu formation(Upper Ordovician) and Lianglitager formation (Middle Ordovician) which can be subdivided into limestone member with muddy intercalation, pure limestone member and muddy limestone member. They are of good comparable behavior in the whole area. Hence it is considered that in Middle-Upper Ordovician of Tazhong area obviously exists lithostratigraphic diachroneity and synchronous aniso-facies phenomena which is in lack of and unconformity contact with Lower Ordovician. References | Related Articles | Metrics

Study on Non-Darcy Fow Pattern in Low Permeability Oil Reservoir Yao Yuedong, Ge Jiali 2000, 21 (3):  213-215.  Abstract ( 82 )   PDF (282KB) ( 216 )   Save The study and analysis of flow experimenting core data are made by using dimentionless analysis method, providing three flow sections (extra low velocity flow section, low flow section and Darcy flow section) by Reynolds number in order as well as the math expressions for each section, These special flow phenomena have been explained in physics and mechanics by means of boundary layer theory. Finally, the effect of the different flow performances on developing an oilfeld is analyzed. This study is of some significance for guiding an oilfeld development. References | Related Articles | Metrics

Study on the Method of Developing Permeability Models by Using Flowing Units Lei Qihong, Song Ziqi, Tan Chengqian, Wu Shaobo, Gao Xingjun 2000, 21 (3):  216-219.  Abstract ( 75 )   PDF (354KB) ( 203 )   Save Continental reservoir rocks are normally of serious heterogeneity, and different block areas or different horizons are of different permeabilities. They are hardly described with same type permeability models, but differentiating them. By utilizing flowing zone index(Im), the sixth pay zone group(E2S) in Zhengwu oilfield is divided into four types of flowing units, each representing the different lithologic and physical properties. This paper makes development of well log interpretation models with different permeabilities in different types of flowing units, which can give higher accuracy of permeability parameters, reflect sedimentary characteristics and heterogeneity in detail and provide reliable related parameters for geologic model development. References | Related Articles | Metrics

Determination Approach of Development Indexes in A Condensate Gas Reservoir at Constand Volume Ma Yongxiang 2000, 21 (3):  219-219.  Abstract ( 64 )   PDF (81KB) ( 127 )   Save By linking equation of geologic equilibrium in a condensate gas reservoir,exponential equation of gas well productivity with gas reservoir's fluid characteristics,prediction of development indexes of a condensate gas reservoir at constant volume has been made, establishing individual behavior process of pressure, yielded dry gas, condensate oil as well as each pseudo-component, and determining stable rate period and declining ended time during production of a condensate gas field. Field application showed that this method is simple and reliable, and can be effectively used for comprehensive evaluation, progress selection and macroscopic decision of a condensate gas field development. References | Related Articles | Metrics

Evaluation of Proved Unproducing Reserves and Operating Management Mode Dong Guanghua, Wang Xiangdong, Bai Hexian, Qiu Yang, Liu Yanming 2000, 21 (3):  220-223.  Abstract ( 81 )   PDF (352KB) ( 226 )   Save At present, evaluation of proved unproducing reserves is virtually an evaluation of incremental benefits following newly-increased investments. Conventional economic evaluation methods available are unable to guide the investment decision-making for development of proved unproducing reserves of each oilfield. Based on geologic evaluation, this paper presents an evaluation method named”meager profit production" (or incremental benefits evaluation method). Based on geologic evaluation results, these reserves are divided into economic Class I and Class II, as well as meager proft production" Class I and Class II that belong temporarily to non-profit reserves. In addition, the procedures for using advanced and practicable measurements to reduce investment and cost for development of proved unproducing reserves are proposed along with relevant operating management modes. These will have profound and immediate significance in activating proved unproducing reserves property. This study aims at activiting existing property, properly evaluating probable economic benefits derived from the reserves so as to serve for making decisions of these investments in Xinjiang oilfields. References | Related Articles | Metrics

Calculations of Radiuses of oil and Gas Two-Phase Flow Area of Bottom Hole Reservoir in A Volatile Oil Well Liu Yuguo 2000, 21 (3):  224-227.  Abstract ( 111 )   PDF (444KB) ( 194 )   Save Volatile oil reservoirs are almost found everywhere,but few methods are available to quantitatively and quickly evaluate their regional extents resulted from oil/ gas segregation in bottom hole volatile oil zone for a production well. This article presents a procedure for calculating these regional radiuses based on fluid properties of oil/gas twophase flow and single phase flow regions, which provides necessary parameters for proper evaluation of volatile oil reservoir production. References | Related Articles | Metrics

Preferred Selection of Sidetrack Horizontal Well Location in the Conglomerate Reservoir-an example from Baikouquan oilfield Chi Jianping, Qin Jianhua, Liu Shunsheng, Dai Canxing 2000, 21 (3):  227-227.  Abstract ( 91 )   PDF (81KB) ( 132 )   Save The technology of sidetrack horizontal drilling is a new type of oilfield development technology. But the :key that can make a good beneft or not is dependent on preferred well locations. Based on its special properties and recent technological levels together within the geologic features, remaining oil distribution and present production status of conglomerate oilfelds, the authors proposed preferred principles for the pilot test area, target area or zone and base well locations of sidetrack horizontal drilling. Application of them to Baikouquan oilfeld showed that following implementation of preferred selected well locations, outstanding production effectiveness has been achieved, providing a set of practical and effective techniques of prefered selection of sidetrack horizontal well locations in aging oilfield. References | Related Articles | Metrics

An Approach to Application Considerations of Garden's Relation Huang Xiaoping, Gao Yuchun 2000, 21 (3):  228-229.  Abstract ( 93 )   PDF (189KB) ( 132 )   Save Wave impedance inversion is an important tool for reservoir study and lithology interpretation, in which sonic and density log curves are indispensable basic data, since their qualities directly affect those of the inversion and interpretation results. This paper makes analyses of the considerations of using Garden's relation and its processing procedure under special conditions. It draws a conclusion that fully effective application of Garden's relation can result in ideal sonic and density log curves. References | Related Articles | Metrics

Ullization of 3D Visualized Technique for 3D Seismic Interpretation in Junggar Basin Li Yang 2000, 21 (3):  230-232.  Abstract ( 114 )   PDF (305KB) ( 206 )   Save 3D seismic survey used to be applied in traditional two dimensional interpretations in which principal seismic line is often paid attention to from part to whole train of thought, which some adjacent or connected stratigraphic characteristics on the line direction would be omitted, leading to incomplete interpretation result. By utilizing 3D visualized technique for 3D seismic interpretation in Junggar basin, that is, 3D interactive interpretation are simultaneously made for 3D seismic data volume in principal line, branch line and time directions, it is favorable to improving the accuracy of seismic structural interpretation and recognizing distribution of lithosome. Three cases show that this visualized technique provides a new explanation for 3D seismic detailed interpretation from the view point of "body". References | Related Articles | Metrics

The Functions Following Improvement of Introduced Project Software for A Chemical Flooding Model(UTCHEM) Chen Jianguo, Liu Xiaokai 2000, 21 (3):  233-234.  Abstract ( 121 )   PDF (277KB) ( 171 )   Save Improvement and perfection of the introduced project software is made as necessary and enable to break through a limitation of only 25 wells, being used in the chemical flooding model(UTCHEM), and increasing corrected or modified interpolation modulus of field data as well as reports of well pressure, production rate and water cut. Having given pre- and post-processing to UTCHEM, functions of tables and graphs are added, achieving project management of fles, enlarging applied scopes of the model. Furthermore, it can run VIP and batch processing jobs at any time, hence improving use efficiency between the model and computer. Related Articles | Metrics